Wrist watch spring strap



May 19 1931- v lPz. B. BARTON 1,806,439

WRIST WATCH SPRING STRAP Filed Sept. 8, 1928 Patented May 19, 1931 t UNITED STATES PATENT OFFICE.

ROBERT IB.'IBARTON, OF RIVER FOREST, ILLINOIS, ASSIGNOR TO ELGIN NATIONAL WATCH COMPANY, OF CHICAGO, ILLINOIS, .A CORPORATION OF ILLINOIS wmsT WATCH SPRING STRAP application mea september s, 192s. "serial No. 304,743.

This invention relates to improvements in wrist watch cases and straps, and more particularly to an easily removable and replaceable watch strap of resilient material.

\ According to the present invention, a wrist watch strap is provided which comprises'a band of resilient metal with loops thereon to receive the securing pins of awatch case, the stip continuing beneath the watch case itse A Another feature of the present invention is in the provision of va wrist watch strap of spring metal which is of C-shape sothat it man be easily removed and replaced upon the wearers arm without the vunfastening and fastening of any type of securing device, but is held engaged through the resiliency of the material itself.

A further feature of the invention is the provision of a simple and unobtrusive means by which the watch case may be secured to the strap itself.'

'ilhese and other features of the invention will be fully described with respect to an illustrative Jform of construction shown on the accompanying drawings, in which:

Figure 1 is an edge view of the strap with a watch case mounted thereon.

Fig. 2 is a plan view of the same.

Fi 3 is a section: on a larger scale substantlally on line 3-3 of Fig. 2.

Fig. 4 is a `corresponding section substantially on line 4 4 of Fig. 2.

In these drawings, the wrist strap 10 shown as formed of thin resilient metal, preferably non-corrosive in nature; and is of a C-shape, having a gap 1l therein` by means of which the strap may be inserted over or removedffrom the wearers arm. A-t the portion 12 oi the strap having the greater radius of curvature, the strap is adapted to receive a `watch case 13 which, for example, may have a curved bottom 14 fitting the shape of the v portion 12 of the strap. At the ends of this portion 12 of maximum radius of curvature, the strap 10,12, 10 is rovide'd with outwardly turned loops 15 l ig. 4) each of which has a narrow throat 16 at which the parts of the band are brought close together. It

l will be noted that the inner surfaces of the larged portion of each of the loops 15 (Fig. l l I The enlarged portion of each of the loops 15 is provided with a sleeve 19 having a coil spring 20 therein to react against the heads 21 of the two plun er pins 22 which project at each side beyondg the band 10 (Fig. 2) and are of a diameter closely fitting the apertures 18 in the lateral bars 17.

Anygiven watch case having lateral bars or similar members 17 with apertures 18 therein at a proper spacing with respect to one another and to the bottom 14 of the watch case may be assembled upon a wrist watch strap o r band 10, 12, 10 of similar spacing, by repressing the pins 22 at one of the loops 15 and slipping the lateral bars 17 downward and over the respective loop 15 until the plun er pins 22 are forced outward and into and ling the apertures 18, and thus holding the parts together at this point. A similar operation is then accomphshed at the other loop 15 with respect to the correspondin apertures 18 at the 'other end of the bars 1l and the wrist watch case is then held fixedly in position upon the particular band 10, 12 10.

It will be articularly noted thatv the band is formed o a single piece of metal extending from the space 11 around the arm, with the provision of the loops 15 and back to the other side of the gap 11. The resiliency of this band holds it upon the wearers arm and likewise by reason of tlishaping of the loops 15 and the normal approximation of the arts of the band at the neck 16, permits the and to hold the sleeve 19 in'posltion, durin the operation of assembling the lateral ars: while after the watch case has been assembled upon the strap, the lateral bars prevent the withdrawal or displacement of the sleeve 19 in the loop 15, l

It is obvious that the invention is not limited to the illustrative form of construction shown and described: but that it may be emyployed in many ways within the scope of the appended claims.

What I claim asnew and desire to secure by Letters Patent is f 1. In a wrist strap and watch case assemf' bly, a band having loops formed therein and directed outwardly Iaway from the of the Wearers arm, sleeves held in said loops by the resiliency of said band, supportin means on the watch casez and means carrie by the sleeves and enga said su porting i means to hold the watc case and and tof so gether.'

2. A wrist strap for a watch case compusing a band of resilient metal having loops.

formed therein, with the parts of the `band brought together to form a narrow neck for` I the loop, and watch case securing sleeves resiliently held by said loops.

In testimony whereof, I aiiix my signature.

i' ROBERT B. BARTON.

osi'tion 

